MacRumorspoints us to Apple’s how to buy page, where it has been updated saying that the iPhone 4S is now only available in retail stores by reservation only. The page says an iPhone 4S can be reserved after 9:00 PM each day, and will be available for pickup the following day.

An Apple representative told MacRumors that supplies are beginning to disappear, and are pushing customers to the reserve page to ensure they get a device rather than leaving the store empty handed.

It seems highly unlikely that Apple would push away a customer who would come in to buy a device. Perhaps they’ll be selling the remaining stock to those who walk-in. Customers can also order the iPhone 4S online.